# Sonar vs Arc Timeline 4

The clearest difference is rating: Sonar at 4.6 against Arc Timeline 4's 3.9. Sonar also leads on ratings volume (335 vs 23) and review sentiment (69% vs 61%). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Sonar sells 7 in-app purchases, starting at $5.99 per month and Arc Timeline 4 sells 3 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

Sonar holds the better App Store score, 4.6 against 3.9. That said, the two scores are not equally well evidenced: Sonar has 335 ratings behind it against 23, so its average is the more settled of the two. Written reviews point the same way: 69% of Sonar's written reviews are positive against 61% of Arc Timeline 4's.

Both ship on a similar rhythm, roughly weekly. The most recent releases landed on September 26, 2026 and September 27, 2026 respectively.

## The numbers

| Metric | Sonar | Arc Timeline 4 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (335 ratings)](https://appshunter.io/ios/app/sonar-health-and-performance/id1595073849/reviews)** | [3.9 (23 ratings)](https://appshunter.io/ios/app/arc-timeline-4/id6740688708/reviews) |
| Number of ratings | **335** | 23 |
| Positive reviews | **68.7% of reviews** | 60.5% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Weekly | Weekly |
| Monetization | Freemium | Free with in-app purchases |
| Size | 117 MB | 64 MB |
| Requires iOS | **16.6** | 26.0 |
| Devices | **iPhone, Apple Watch** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Sonar Health, Inc.](https://appshunter.io/developer/1595073851) | [Matthew Bruce Greenfield](https://appshunter.io/developer/444610547) |

## What reviewers say

### Sonar

[App page](https://appshunter.io/ios/app/sonar-health-and-performance/id1595073849)

Unify data from all your wearables and lifestyle trackers to gain personalized health insights. Understand your sleep, recovery, stress, and activity with AI-powered analysis and daily guidance to optimize your well-being.

**Highlights:** Syncs with multiple wearables and apps, AI-powered personalized health insights, Daily scores for recovery, sleep, and stress, Detailed training analytics, 24/7 vitals monitoring, Tailored health recommendations

**Features:** macOS Compatibility, Family Sharing, Apple Watch app, Vision Pro support

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Sonar Pro - Monthly (Legacy) | $5.99 | per month |
| Sonar Pro - Monthly | $5.99 | per month |
| Sonar Pro - Annual (Legacy) | $49.99 | per year |
| Sonar Pro - Annual | $49.99 | per year |
| Sonar Pro - Lifetime | $199.99 | one-time |
| Sonar Pro - Lifetime | $249.99 | one-time |
| Sonar Pro - Lifetime | $299.99 | one-time |

**What reviewers like**

- 🚀 Seamless integration
- 👍 Elegant data presentation
- 💡 Comprehensive health tracking
- 🚀 Intuitive user interface
- 👍 Excellent customer support

**What reviewers complain about**

- 🐛 Sync issues
- 💰 Expensive subscription
- 🔍 Lack of transparency on pricing
- 🔍 Limited feature set for free version

**Reported bugs**

- Inconsistent data syncing
- Crashes and freezes
- Unreliable notifications

**Requested features**

- Customizable widgets
- Deeper data analysis and insights
- Improved historical data tracking
- Integration with more wearable devices


### Arc Timeline 4

[App page](https://appshunter.io/ios/app/arc-timeline-4/id6740688708)

This app automatically tracks your location history, including how you travel and how long you stay at places. It learns your habits to provide a detailed, searchable timeline of your daily life, offering insights into your activity and health metrics.

**Highlights:** Automatic background location recording, Smart learning engine for place recognition, Detects over 20 activity types, Searchable trip and place history, Health and activity insights (heart rate, calories), Data stored on device with optional iCloud backup

**Features:** Family Sharing

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Subscription | $4.99 | per month |
| Yearly Subscription | $44.99 | per year |
| Lifetime Purchase | $179.99 | one-time |


## Frequently asked questions

### Is Sonar free?

Sonar is free to download, with in-app purchases available.

### Is Arc Timeline 4 free?

Arc Timeline 4 is free to download, with in-app purchases available.

### Which has better reviews, Sonar or Arc Timeline 4?

Sonar is rated higher. Sonar averages 4.6 out of 5 from 335 ratings, while Arc Timeline 4 averages 3.9 from 23 ratings.

### Do Sonar or Arc Timeline 4 have ads?

Neither Sonar nor Arc Timeline 4 shows ads.

### Which is updated more often, Sonar or Arc Timeline 4?

Sonar ships an update weekly, and Arc Timeline 4 weekly. Most recently, Sonar was updated on September 26, 2026 and Arc Timeline 4 on September 27, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*